OAKLAND, CA - OCTOBER 21: A striking Bay Area Rapid Transit (BART) worker pickets next to a sign honoring two BART workers who were struck and killed by a BART train over the weekend while servicing tracks near the Walnut Creek station on October 21, 2013 in Oakland, California. BART workers continue to strike after contract negotiations between BART management and the transit agency's two largest unions fell apart last week. Management and unions agreed on the financial specifics of the contract but differed on workplace safety rules. An estimated 400,000 commuters ride BART each day.

A San Francisco man is accused of hurling a hammer at BART workers as they picketed outside the Daly City station on Monday.

Vincent Matteucci, 39, pleaded not guilty Tuesday to felony assault charges related to the attack that occurred on the same day that the BART strike ended.

The confrontation began when a companion of Matteucci's hollered at a group of BART employees, “Get your asses back to work,” according to prosecutors.

Matteucci then threw the hammer at the victims, missing them by 15 feet, San Mateo County District Attorney Steve Wagstaffe said.